Help with PTFE Washer: No Stress Relaxation Test

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The discussion centers on the absence of a stress relaxation test for PTFE gaskets, with a user seeking clarification on how to conduct a compression stress relaxation test for these materials. Concerns are raised about the aging and potential failure of PTFE gaskets due to creeping over time, typically after four to six years of use. The user is inquiring if there are any ASTM standards that address this issue. The conversation highlights the need for standardized testing methods to evaluate the long-term performance of PTFE gaskets. Ultimately, the lack of specific testing standards for stress relaxation in PTFE gaskets is a significant concern for users relying on these materials for sealing applications.
jack2100
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I read the related standards about the PTFE gasket. But there is no stress relaxation test for the PTFE gasket, could you please tell me the reason? Thanks very much in advance!
 
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maybe my descirption is unclear. my question is how to do the compression stress relaxation test of PTFE gasket? Now I used the teflon gasket for sealing. the PTFE has the aging issue. After 4 years or 6 years, the PTFE gasket may fail due to creeping, whatever. IS there any ASTM standard for this item?
 
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